This is what I see on mobile.
To me personally the lander looks more professional than the one from DAN. But there are 3 things I would definitely change.
1) H1 and H2 headers are hard to read for me. Try line-height: 1,6 em
2) Look in the bullet points in the image. You have probably set margin-left to a negative number, and the numbers are not appearing in the screen.
3) For mobile, I would suggest to use width: 80% for the buttons, and allign them to center. So they will appear centered and the second button will be exactly below the first one.
Overall seems good to me, especially on desktop. I did not notice other problems.
Hope this helps.
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